Clayton et al. discovered the following relationship between feather-louse size and the body mass of their corresponding bird hosts. What do the authors hypothesize from this relationship about the mechanism of cospeciation of doves and lice?
a. Lice are unlikely to switch to hosts that differ in body size from their original host.
b. Lice will tend to shift to the larger host regardless of their own size.
c. Larger lice are always better at holding onto their hosts.
d. Smaller lice are always better at evading the preening attempts than large lice species.
A
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You have discovered a new species of seal and are observing their behavior on a beach. You see groups of females affiliated with a single male. What data support the hypothesis that sexual selection played a role in the evolution of these behaviors?
A. Most of the offspring of a single group are parented by the male that defends the group. B. Male parentage is independent of group affiliation—females mate with any male on the beach. C. Males spend a large amount of energy on behavioral displays and fighting with other males. D. Females mate on the sly with different males so the parentage of the offspring is uncertain. E. Males switch groups regularly and take turns defending all of the females on the beach from predators.
Genomic analyses of the apple- and hawthorn-feeding races of Rhagoletis suggest that genetic divergence between the
two species has largely been driven by ____ selection, a diversifying form of natural selection.
a. disruptive b. directional c. stabilizing
d. artificial e. sexual
DNA contains all of the following nitrogen-containing bases EXCEPT ____
a. adenine b. uracil c. guanine d. adenine e. thymine
The end products of the citric acid cycle include all of the following except
A) CO2. B) pyruvate. C) ATP. D) FADH2.